Research Of Sediment Heterogeneity Induced By The Biological And Hydrodynamic In The Yellow River Estuary

The biological and hydrodynamic induced sediment heterogeneity in the Yellow River estuary is investigated in the present study. The approaches adopted as follows. (1) Based on the investigation in the Yellow River estuary, the sediment heterogeneity is studied from a view of biological species difference;(2) Based on the investigation at the Diao Kou area, the biological density difference induced sediment heterogeneity is also discussed, (3)Based on the investigation of the strength characteristics of seabed-in front of a bank and nearby area-in a section scale, the hydrodynamic induced sediment heterogeneity is discussed, (4)Through the analysis of biological and hydrodynamic effects of four testing line in the Yellow River estuary, the formation of sediment heterogeneity is also discussed.The Yellow Rriver estuarine is commonly dominated by benthic species, which are important factors in changing the sedimentary conditions. To make it clear that the formation process of seabed heterogeneity filed experiments are carried out at the DiaoKou area. Based on the investigation at DiaoKou area in the delta of Yellow River, we have studied the effects of estuarine species on sediment geological properties including morphologic, penetration strength and grain size of sediments.Based on the investigation of the strength characteristics of seabed-in front of a bank and nearby area-in a section scale, the dynamic response of silt seabed was studied in the Yellow River estuary. Through the impact loading and model analysis a conclusion is made that: the formation of seabed sediment heterogeneity is due to the fine particles flow under wave loading, Thus result in the heterogeneity of seabed..The combination of biological and hydrodynamic effects to the formation of sediments heterogeneity is also discussed in the end.